Micro LED Asymmetric Side Surfaces and Reflective Layer
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Solution Overview
Problem
Micro LEDs face challenges in light efficiency and manufacturing efficiency due to the difficulty in utilizing side light, which is refracted and reflected, and the tilted surface design limits the number of LEDs that can be generated on a growth substrate, increasing power consumption and reducing light efficiency.
Innovation Solution
A micro LED design featuring a vertical first side surface and a tilted second side surface with a reflective layer arranged at an angle of 40 to 50 degrees, surrounded by an insulating layer, to enhance light efficiency and manufacturing efficiency by directing side light towards the top surface for display implementation, while maintaining a compact size and high integration density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a tilted side surface is formed to utilize side light, then light efficiency is improved, but the number of micro LEDs that can be generated on one growth substrate is reduced
Solution Approach 1:
The micro LED structure employs asymmetric side surfaces where the first side surface is vertical and the second side surface is tilted at a specific angle (40-50 degrees). This asymmetric design allows selective utilization of side light from the tilted surface while maintaining a vertical surface that enables efficient light extraction, thereby improving light efficiency without completely sacrificing manufacturing density
Solution Approach 2:
The patent introduces a reflective layer positioned at an angle on the tilted side surface to redirect side light toward the top surface. This adds an optical dimension to the structure, converting previously wasted side-emitted light into useful top-directed light, thus improving light efficiency without requiring changes to the fundamental LED geometry that would reduce manufacturing capacity
2Loss of energy
If side light is refracted and reflected on the top surface, then light utilization is improved, but power consumption increases
Solution Approach 1:
The reflective layer is pre-positioned on the tilted side surface during the manufacturing process, creating a built-in light redirecting system. This preliminary optical configuration ensures that side light is automatically redirected toward the top surface without requiring additional active components or energy-consuming mechanisms during operation, thus improving light utilization while avoiding increased power consumption
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution improves light efficiency by redirecting side light towards the top surface, increasing the number of micro LEDs that can be produced on a substrate, and enhances manufacturing efficiency by optimizing the structure for better light utilization and uniform luminance.
Implementation Method 1
a reflective layer arranged to partially surround the insulating layer in an area of the insulating layer corresponding to the second side surface
Implementation Method 2
a second side surface tilted with respect to the first side surface, and including a first tilted side surface of the active layer and a second tilted side surface of the second semiconductor layer
Data Source
AI summary
A micro light emitting diode (LED), including a first semiconductor layer doped with an n-type dopant; a second semiconductor layer doped with a p-type dopant; an active layer arranged between the first semiconductor layer and the second semiconductor layer, and configured to provide light; a first side surface including a vertical side surface of the first semiconductor layer; a second side surface tilted with respect to the first side surface, and including a first tilted side surface of the active layer and a second tilted side surface of the second semiconductor layer; an insulating layer arranged to surround the first side surface and the second side surface; and a reflective layer arranged to partially surround the insulating layer in an area of the insulating layer corresponding to the second side surface.